20．If there is something that appears most infrequently on Chinese dining tables，it is doufu-beancurd．Beancurd looks like soft cakes and it's made from dried soybeans．Beancurd used to be considered a favourite of the poor because of its low cost．Beans have high yields （产量） every year with their short growing period and suitability for various soil both dry and wet．
Historical records show beancurd was invented by Liu An．Prince of Huannan and uncle of Emperor （皇帝） Wu of Han Dynasty （206BC-AD 220）．He had a dream of finding the pill for longevity （长寿）．He traveled all over the country and found soybeans，which looked much the same as gold in terms of colour．He collected soybeans，put them in the water and crushed them into pulp （浆）．It got solidified and became known as doufu．Although it's not able to keep longevity，it's really good for one's health with high protein and low fat．
With a long history，beancurd is rooted deep in Chinese culture．People eat more meal and fish than beancurd．But they are encouraged to have beancurd every once I a while for it's really good for health．Most Chinese people still keep beancurd as one of their favourite dishes．
53．Why was beancurd considered to be liked by the poor？C
A．It's easy to make．
B．It's easy to cook．
C．It's cheap．
D．It's good for health．
54．Where can beans grow well？D
A．Only in we soil．
B．In dry soil．
C．In soft soil．
D．In any soil．
55．What appears more often on the dining table in poor areas？D
A．Meat．
B．Fish．
C．Egg．
D．Beancurd．
56．Why did Liu An travel all over the country？B
A．He had a dream．
B．He wanted to find something that could make people live longer．
C．He wanted to invent beancurd．
D．He wanted to find gold．
57．How long has beancurd been invented？D
A．It's about 1 700 years．
B．It's less than 2 000 years．
C．It's 1 500 years．
D．It's more than 2 000 years．
